an inevitable (and hella annoying) obsession with the internet phenomenon Slenderman after watching all the youtube videos that feature him/her/it. symptoms include: insomnia, obsession with slenderman, obsession with totheark, slendysearching online in your free time, paranoia, fear of the dark, fear of everything else, dark circles around the eyes, and jumpiness.

Helga: i cant sleep after watching all those stupid videos but we should go watch more!
Gaylord: oh wow you have a bad case of slender fever